Emmy-winning actress Jane Lynch, who plays the brash cheerleader coach on the hit TV show “Glee,” hosted “Saturday Night Live.” On the program, she had an opportunity to do something that she hadn’t done on “Glee”: sing. During her monologue, she said she wrote a theme song for “Glee” and delivered an over-the-top singing performance of it, which was more like a tribute to her character Sue.

And Lynch also reprised her role as Sue in a skit parodying the characters from “Glee” with “SNL” cast member Jason Sudeikis playing music teacher Will Schuester. Other parts that Lynch played including a disheveled mom on “The New Boyfriend Talk Show”; a therapist who places herself into her patient’s visualizations, and a customer who tries to return a handbag to Denzel Washington (Jay Pharaoh) working behind the returns and exchange desk.

Among the skits on last night's show were spoofs of celebrity attorney Gloria Allred and TV financial host Suze Orman. There was a commercial that parodied Delaware Senate candidate Christine O’Donnell, who denied that she is a witch; and one about a Facebook filter for snooping moms.

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On Weekend Update, Facebook founder Mark Zuckerberg (played by Samberg) stopped by to address the inaccuracies in “The Social Network.” He asked why he was portrayed in the movie by Jesse Eisenberg, whereas Napster’s Sean Parker was played by superstar Justin Timberlake.

The musical guest on last night’s episode was singer Bruno Mars. Dressed along with the band in an jacket and tie that was reminiscent of early Motown acts, Mars first performed the romantic hit “Just the Way You Are,” and then later in the show “Grenade.”

Next week’s episode of “Saturday Night Live” will be a repeat of the season premiere hosted by Amy Poehler with musical guest Katy Perry; the next new program will be hosted by Emma Stone with band Kings of Leon on Oct. 23.